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Water system high-voltage window anti-freezing electrolyte and application thereof

A technology of voltage window and electrolyte, applied in hybrid capacitor electrolytes, circuits, electrical components, etc., can solve problems such as hindering ion transmission, reducing solubility, limiting the application of high-concentration electrolytes, etc., to achieve cost reduction, good electrochemical performance, The effect of ensuring safety

Active Publication Date: 2020-06-05
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under low temperature conditions, the solubility of the solute will decrease, resulting in salting out of the high-concentration electrolyte, and the precipitated inorganic salt will adhere to the electrode material and the separator, hindering the transmission of ions, and causing the electrochemical energy storage device to fail to work, which is serious. Limits the application of high-concentration electrolytes in low-temperature environments

Method used

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  • Water system high-voltage window anti-freezing electrolyte and application thereof
  • Water system high-voltage window anti-freezing electrolyte and application thereof
  • Water system high-voltage window anti-freezing electrolyte and application thereof

Examples

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preparation example Construction

[0043] The preparation method provided by the invention is simple and convenient to operate and easy for large-scale production.

[0044] The present invention provides the application of the water system high-voltage window antifreeze electrolyte in the supercapacitor or battery described in the above scheme. The present invention has no special requirements on the positive electrode, negative electrode and diaphragm of the supercapacitor or battery; the present invention has no special requirements on the assembly method of the supercapacitor or battery, and the assembly method known to those skilled in the art can be used.

[0045] In a specific embodiment of the present invention, activated carbon is used as the positive electrode and the negative electrode respectively, and glass fiber is used as the diaphragm to assemble a button supercapacitor; activated carbon is used as the positive electrode, and sodium titanium phosphate is used as the negative electrode to assemble ...

Embodiment 1

[0049] NaClO 4 - Preparation of acetonitrile electrolyte:

[0050] 1.7mol NaClO 4 Add to 6mol water, stir and mix to obtain NaClO with a mass molar concentration of 15.74mol / kg 4 aqueous solution; then 2 mol of acetonitrile was added to NaClO 4 In the aqueous solution, stirring and mixing to obtain NaClO with a mass molar concentration of 8.94mol / kg 4 base electrolyte.

[0051] To the NaClO that embodiment 1 obtains 4 Electrochemical performance tests were performed on the base electrolyte, as follows:

[0052] (1) the NaClO that test embodiment 1 obtains 4 The voltage window of the base electrolyte: with the stainless steel column as the working electrode and the counter electrode, Ag / AgCl as the reference electrode to form a three-electrode system, the electrolyte of Example 1 is tested for the voltage window, and the test results are as follows figure 1 shown. From figure 1 It can be seen that the electrolyte solution of Example 1 has a stable voltage window of 2.8...

Embodiment 2

[0063] NaClO 4 - Preparation of Methanol Electrolyte:

[0064] 1.7mol NaClO 4 Add to 6mol water, stir and mix to obtain NaClO with a mass molar concentration of 15.74mol / kg 4 aqueous solution; then 2 mol methanol was added to NaClO 4 In the aqueous solution, stirring and mixing to obtain NaClO with a mass molar concentration of 9.88mol / kg 4 base electrolyte.

[0065] Test the NaClO that embodiment 2 obtains according to the method for embodiment 1 4 The voltage window and conductivity of the base electrolyte, the electrolyte of Example 2 was measured to have a stable voltage window of 2.8V, and the conductivity was 140.61mS / cm.

[0066] According to the method for embodiment 1, embodiment 2 is obtained NaClO 4 -Methanol electrolyte is used in supercapacitors, and cyclic voltammetry tests are carried out on supercapacitors at room temperature, 0°C, -20°C, -40°C and -60°C, and the test results are as follows Figure 6 shown. From Figure 6 It can be seen that the supercap...

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Abstract

The invention provides a water system high-voltage window anti-freezing electrolyte and application thereof. The electrolyte provided by the invention comprises an inorganic salt electrolyte, water and an organic solvent, wherein the freezing point of the organic solvent is-12 DEG C to-97 DEG C, the organic solvent and water are co-dissolved, and the inorganic salt electrolyte is soluble in the organic solvent; and the molar ratio of the inorganic salt electrolyte to the water to the organic solvent is (1.1-3.1): (4.5-6): (2-7). According to the electrolyte provided by the invention, salting-out of the electrolyte in a low-temperature environment can be avoided, a voltage window of an aqueous electrolyte can be widened, and higher ionic conductivity can be provided, so that an electrochemical energy storage device also has excellent electrochemical performance in the low-temperature environment.

Description

technical field [0001] The invention relates to the technical field of low-temperature electrochemical energy storage, in particular to a water-system high-voltage window antifreeze electrolyte and its application. Background technique [0002] Aqueous electrochemical energy storage devices have attracted widespread attention due to their high safety and low cost. Electrolyte plays a key role in the operation of electrochemical energy storage devices, but the high freezing point of water (0°C) limits the application of water-based electrochemical energy storage devices, and the decomposition voltage of water is 1.23V, which is for The realization of high energy density electrochemical energy storage devices is very unfavorable. [0003] At present, the voltage window of the patented aqueous electrolyte is generally below 1.2V (CN 105280397 B, CN 104505263 B). In recent years, there have been some patent applications to achieve a wide voltage window of aqueous electrolytes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0568H01M10/0569H01G11/58H01G11/60H01G11/62
CPCH01G11/58H01G11/60H01G11/62H01M10/0566H01M10/0568H01M10/0569Y02E60/10
Inventor 阎兴斌孙英伦窦青云马亚兰赵攀马鹏军
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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